How can a magnetic field be produced, using a wire, a battery, and and a nail?

By wrapping wire around the nail and attaching battery to the wire ends

We can use a pair of wire cutter to remove a few centimeters of insulation from each end of the wire that is used. Then neatly wrapping the wire around the nail. The more wire we wrap around the nail, the stronger our electromagnet will be. After that attaching the battery to the ends of the wire will turn the coil into an electromagnet.

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.